Fire mage trinket question

Just now I received Heroic Bell of Enraging Resonance from Heroic Atramedes. I checked Elitist Jerks forum, but it seems that the BiS list for fire mage is outdated. I use Rawr Debug Build 4.1.05.60775 and it says that my current trinkets are BiS for my build (fire). I tried to add couple more BiS (ilvl 372) items in Rawr and its still saying Soul Casket is better than this trinket. I even put all BiS items and still, DMC: Volcano + Soul Casket are still best.

The weird thing is Rawr says crit > mastery in relative stat value, however it picks Soul Casket over the Bell. Is Rawr being programmed to give preference towards "usable" trinket rather than "proc"? So, is Soul Casket better than Heroic Bell of Enraging Resonance?
I'm sure someone will correct me if I'm wrong, but iirc as Fire mastery is your weakest stat, I'm unsure about the specifics, but I think the Heroic Bell and Heroic Mirror are your BiS, i think with the 359's the DMC:V might be better than the mirror because you can reforge the mastery to hit (if you need it) but I'm a bit rusty there. The bell should be better than the VP trinket though.

Edit: after I stopped being Lazy and pulled up the gear lists that SimC uses, it looks like the DMC and V&T trinket are the BiS trinkets, which are both valued for their int procs. Assuming you don't have a mirror available I believe the Bell is your next best choice, and I can't see the 359 soul casket being better than the 372 Bell.
Can't remember where I read it, but I think "on use" trinkets in Rawr are modeled assuming they are used at optimal times(i.e. Bloodlust, Volcanic Potion(I think), coordination with other procs, and possibly Combustion). The DPS value/ranking displayed in Rawr may be a lot higher than you might actually see in a given encounter or even training dummy sessions because of this. I believe you can change this behavior in your settings.

I've seen this debate many many times because it's counter intuitive to what we know about the spec, so let me break it down.

When comparing the tradeoffs between the two trinkets, think of it this way.

Soul Casket, gives you a overall higher DPS potential and control over when it is applied.

Bell of Enraging Resonance in comparison, will give you a lower "top end" DPS potential, but improve the reliability of your DPS(it will lower the overall variance of your DPS over a given time period). That 2% extra crit lessens the chance of a "dry spell", increases Hot Streak procs, additional chances to keep your ignite rolling which can lead to higher combustions AND more opportunities to use Combustion.

Nothing better than hitting a dry spell on Halfus when you really need to get a big combustion rolling. On my attempts last night, I would hit 70k+ on some pulls, and 30k or less on others doing the exact same thing. Any trinket that lessens that variance is a welcome addition to me.

Bell is the hands-down winner IMO because it really helps the spec function properly, regardless of what the simulations say.